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SerializableFunction.java
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SerializableFunction.java
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/*
* Copyright 2000-2022 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.vaadin.server;
import java.io.Serializable;
import java.util.function.Function;
/**
* A {@link Function} that is also {@link Serializable}.
*
* @see Function
* @author Vaadin Ltd
* @since 8.0
* @param <T>
* the type of the input to the function
* @param <R>
* the type of the result of the function
*/
@FunctionalInterface
public interface SerializableFunction<T, R>
extends Function<T, R>, Serializable {
/**
* Returns a function that always returns its input argument.
*
* @param <T>
* the type of the input and output objects to the function
* @return a function that always returns its input argument
*/
static <T> SerializableFunction<T, T> identity() {
return t -> t;
}
}